Hi,
I’m re-designing EC21-J PCB.
The power is supplied via
USB wall adapter 5V3A → DCDC (ISL8002IRZ-T : buck converter 2A) → EC21-J
The power regulator originally used was rated 2A, but it’s now difficult to source, so I’m searching for alternative (pin-to-pin compatible).
I found one (ISL80020FRZ-T7A) from Renesas, but the current rating is 1.5A.
I’d like to know if 1.5A DCDC is acceptable or not.
From the datasheet of EC21-J, there’s two description about supply current.
Quectel_EC21_Hardware_Design_V1.5.pdf (1.2 MB)
- Table 32: Power Supply Ratings - Maximum power control level on GSM900 : max 2.0A
- Table 39: EC21-J Current Consumption : below 800mA
In my understanding, EC21-J used in Japan doesn’t support GSM fallback, so the peak current is below 1A, thus the 1.5A DCDC is acceptable.
Any advice would be greatly appreciated.
Thank you,
Takashi